Retsch GM 300 - Manual (Page 24)

Operating the machine
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Fig. 12: Inserting the grinding jar and closing the device.
5.7.1 Grinding container - use with different materials
The material properties specified refer to samples from the main area of
applications: food or animal fodder
The plastic grinding jar is less suitable for dry, tough or fibrous samples.
Stainless steel is recommended for these samples as well as all others from the
specified field of applications.
5.8 Grinding Jar Lid Sealing Rings
The grinding jar cover is supplied as standard with a sealing ring inserted in the
upper groove.
When grinding dustyor very watery sample material, you can insert the second
supplied sealing ring into the grinding jar cover. This prevents sample material
escaping.
4. 6. 5.